Template for sewing devices

ABSTRACT

An adjustable template for use in a sewing device for sewing workpieces of different shapes and sizes. The template comprises a supporting plate consisting of two essentially symmetric halves displaceable against one another. A plurality of segments each having an oblong hole and a bearing surface, is slidably secured in slotted holes formed in the supporting plate halves in a longitudinal and angular direction for aligning said bearing surface of said segments according to the required course of the seam. Two of the plurality of segments forming the internal corners of the template, are provided with means for moving template follower means out of the internal corners into a new path after entering the corners. A sewing device is also disclosed, which is provided with such an adjustable template.

United States Patent 1 1 Scholl et al. I

Filed? TEMPLATE FOR SEWING DEVICES Inventors: Hans Scholl, Bielefeld; Jochen Fischer, Brackwede, both of Germany Assignee: Koch Adler AG, Bielefeld,

Germany Sept :28 1972 Appl. No.1 292,893

Foreign Application Priority Data Oct. 8, 1971 Germany P 21 50 197.3

U.S. Cl 112/121.12, 33/23 K, 74/568, 90/62 R Int. Cl. .L'. D05b 21/00 Field of Search 1l2/l21.12, 121.15; 144/144; 33/23 K, 175, 174 G, 174 PA, 174 PB; 90/62 R, 62 A; 74/568; 82/14 R; 51/100, 127

References Cited UNITED STATES PATENTS Overholt 90/62 Lica 33/23 K Hayes et al. Bono..... ll2/l2l.l2

Scholl et al. l12/12l.l2 Jullien-Davin 74/568 4/1949 6/1958 4/1963 ll/l965 10/1968 3/1969 V Primary Exa i rtine;Jar nesR. Bole r I Nov. 27, 1973 3,434,370 3/l969 Scholl et al., 33 23 K 3,654,817 4 1972 Kano 74 5011 3,695,194 10 1972 Hcimann 112 121.1s FOREIGN PATENTS OR APPLlCATlONS 1,924,938 11 1970 Germany 112 121.12

Assistant ExaminerWai M. Chan Att0mey.lacob L. Kollin ABSTRACT An adjustable template for use in a sewing device for sewing workpieces of different shapes'and sizes. The

- template comprises a supporting plate consisting of two essentially symmetric halves displaceable against one another. .A plurality of segments each having an oblong hole and a bearing surface, is slidably secured in slotted holes formed in the supporting plate halves in a longitudinal and angular direction for aligni'ng said bearing surface of said segments according to the required course of the seam. Two of the plurality of segments forming the internal comers of the template, I

are provided with means for moving template follower means out of the internal comers into a new path after entering the corners. A sewing device is also disclosed, which is provided with such an adjustable template.

8 Claims, 7 Drawing Figures PMENIEDHSY 27 ms 7 3.774.558

SHEE 10? 2 Fig.7

m'mnmsve um 3.774.558

SHEET 2 IT? 2 1 TEMPLATE FOR SEWING DEVICES BACKGROUND OF THE INVENTION The invention relates to a template for use in sewing devices for sewing workpieces of different shapes and sizes and which is arranged on a supporting plate and on which bears a driven roller. 1

There is already known sewing machine equipment, constructed to prevent the changing of the overall length of a predetermined seam pattern, whereby the sewing machine equipment is readily adaptable to sew like patterns of different lengths. This known equipment includes a sewing machine having a table and a fabric holding frame movable on the table through a rigid connection with a slide or follower particularly adapted to follow the movements of a feeler pressing against a shaped pattern, which may be readily extended or retracted to any desired length. Such a device is disclosed in the US. Pat. No. 3,216,380.

US. Pat. No. 3,407,759, discloses a rotary table in an automatic sewing machine installation having segments displaceable in a radial plane for receiving workpieces to be sewn. Each of the segments is provided with two patterns and two workpiece clamp holders for a left and a right half of a workpiece carried by two adjacent segments. A link is provided for bridging both parts of the template, and magnetic rollers are emplaced against said link during the passage from one template to another.

These known devices having adjustable templates, are only suitable for sewing like patterns of different lengths.

It is an object of this invention to reduce the number of templates required in template-controlled sewing devices for producing workpieces of different shapes and sizes, in order to reduce the costs of changing over the devices to workpieces of different shapes and sizes.

It is a further object of this invention to provide a template, which is adjustable with respect to the lengths and the sizes of workpieces to be sewn.

Still a further object of this invention is to prevent an interruption of the feed. of a magnetic template follower means after it arrives at an internal corner of the template.

SUMMARY According to the invention the above problems are 4 solved by providing an adjustable template, which comprises a supporting plate provided with a plurality of slotted holes arranged in longitudinal and angular direction with respect to said supporting plate, a plurality of segments having wedge-shaped lateral edges, a bearing surface for a template follower means and an oblong hole in the longitudinal direction of each of said segments, and setscrew means within said oblong holes and said slotted holes for fastening said segments to said supporting plate after alignment of said bearing surfaces of said segments according to the required course of the seam.

Said segments fastened in said slotted holes, which run in an angular direction with respect to said longitudinally slotted holes, are provided with an overhanging rail for forming a lateral bearing surface for said template follower means.

The adjustable template may be provided with an auxiliary segment having a curved inner portion and disposed below the plane of and oppositely to said segment having an overhanging rail. Said template follower means includes a driven upper roller bearing against said bearing surfaces of said plurality of segments and said segments having an overhanging rail, and an oppositely driven roller mounted coaxially with said upper roller and bearing against said curved inner portion of said auxiliary segment.

The supporting plate may consist of two essentially symmetric halves displaceable against one another. The segments are provided with tapped holes. A guide rail is provided for connecting said segments located on one of said two halves with said segments located on the other half of said supporting plate. This rail is provided with an oblong hole and with fastening means for attaching said guide rail to the tapped holes, which are provided in the segments.

Two of said segments which form an internal corner of said template, are symmetrical parts provided with an overhanging rail and means for moving said template follower means out of said internal comer into a new path after entering the comer. For this purpose, the template follower means including a driven roller bearing against said segments, is further provided with a gear pinion, which 'ismounted coaxially withsaid roller, and said means for moving said template follower means comprises a toothed segment eccentrically pivoted on each of said two segments and which acts like a lever when the gear pinion meshes with the toothed segment after entering said internal corner, in order to push said roller and said gear pinion out of the internal corner into a direction of course determined by the curve of the template, and a spring means for holding and removing said toothed segment into the normal position afterdisengaging said gear pinion from said toothed segment.

Other and more specific objects and features of the invention will be apparent from the following description of the preferred embodiment when read with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a bottom elevational view of the template according to the invention; 7

FIG. 2 is a section taken along line II-II of FIG. 1, on an enlarged scale;

FIG. 3 is a partial view of a sewing unit a template according to the invention;

FIG. 4 is a perspective partial top view of the template;

provided with FIG. 5 is a section taken along line V V of FIG. 1,

on an enlarged scale;

FIG. 6 is a section taken along line VI VI of FIG. 5 and FIG. 7 is a section taken along line VIII VIII of FIG. 5.

DESCRIPTION OF THE PREFERRED EMBODIMENT low shaft 12. The hollow shaft 12 (FIG. 2) is formed with a lower roller 14. In the hollow shaft 12 is pivoted a shaft 15 carrying at its lower end a third bevel gear 16, which also meshes with the bevel gear 11 to cause an oppositely directed rotation of the shaft 15 with respect to the hollow shaft 12. A gear pinion 19 and an upper roller 18 are secured to the shaft 15 by means of a screw 17. The hollow shaft 12 is surrounded by a coil 20 for magnetizing the rollers 14, 18 and the gear pinion 19.

In a two-part supporting plate 21 having two essentially symmetric halves 22, 23, which are displaceably secured to the support 1 (FIG. 3), there is provided a plurality of longitudinally slotted holes 24 and angularly slotted holes 25, in which are displaceably disposed segments 27, 28, 29 formed with oblong holes 26 and fastened to the halves 22, 23 by means of clamping screws 30 and nuts 31. The segments 27 are formed with wedge-shaped lateral edges 32,33 and a bearing surface 34 for the upper roller 18, and further provided with tapped holes 35 for securing a guide rail 36 bridging the space 37 (FIG. 1) between the halves 22, 23 of the supporting plate 21 by means of screws 38. For varying the space 37, the guide rail 36 serving as a rolling surface for the gear pinion 19, is provided with an oblong hole 39. The symmetrically formed segments 28 28' are provided with an overhanging rail 40 formed with an oblong hole 41, for connecting with a segment 27 or 29 by means of the screw 38 and for serving as a bearing surface 42 for the gear pinion 19.

Disposed on the segments 28, 28 are toothed segments 44, which are pivoted about bolts 43 against the tension of two torsion springs 45, 46 and which cooperate with the gear pinion 19. The bolts 43 are provided with a shoulder 47, on which abuts the toothed segment 44 with a slot 48, in which are received the ends of the torsion springs 45, 46. The free ends 49, 50 of the biased torsion springs 45, 46 are situated at a downwardly bent lug 51 of a disc 52, which is slipped onto, the bolt 43'and secured against lifting by means of a guard ring 53. Into the toothed segment 44 is inserted a pin 54, on which abut the ends 49, 50 of the springs 45, 46 for keeping the toothed segment 44 in a normal position.

The segment 29 is also provided with an overhanging rail 55 for leading the upper roller 18 and to which is secured a rail 56 by means of a screw 57. A segment 58 is connected with the rail 56 and cooperates also with the upper roller 18.

An auxiliary segment 59 is disposed below the plane of, and oppositely to the segment 29 and cooperates with the lower roller 14, which is driven a direction opposite to the upper roller 18. The auxiliary segments 59 are removeably secured to the supporting plate halves 22 and 23 by means of distance pieces 60 and screws 61.

Situated on the support 1 is a workpiece clamp holder 62, which clamps the workpiece 62 to be sewn according to the course of the template by means of the needle 6, which is disposed coaxially with the rollers 14, 18 and the gear pinion 19. I

As may be apparent from FIG. 1, the segments 27, 28, 28, 29, 58, 59 and the rails 36, 56 can be removed from the slotted holes 24 resp. the oblong holes 26, 39, 65

of rotation of the motor 9, the rollers 14, 18 and the gear pinion 19 roll along a path, which extends either from A to B or from B to A, whereby either the toothed segment 44 located on the segment 28 or the toothed segment 44' located on the segment 28 causes, the rollers 14, 18 and the gear pinion 19 to be driven out of the comers as a result of the lever-like action of the toothed segments 44, 44 after entering the comers of the template.

What we claim is:

1. An adjustable template for use in a sewing device for sewing workpieces of different shape and size, comprising a supporting plate provided with a plurality of slotted holes arranged in longitudinaland angular direction with respect to said supporting plate, a plurality of segments having wedge-shaped lateral edges, a bearing surface for a template follower means and an oblong hole in the longitudinal direction of each of said segments, and set screw means in said oblong holes and said slotted holes for fastening said segments to said supporting plate after alignment of said bearing surfaces of said segments according to the required course of a seam.

2. An adjustable template according to claim 1, wherein said segments fastened in said slotted holes running in an angular direction with respect to said longitudinal slotted holes, are provided with an overhanging rail for forming a lateral bearing surface for said template follower means.

3. An adjustable template according to claim 2, wherein said template comprises a plurality of said segments having a bearing surface for said template follower means, said segments having an overhanging rail for forming a lateral bearing surface for said template follower means, and an auxiliary segment having a curved inner portion and disposed below the plane of and oppositely to said segment having an overhanging rail, said template follower means including a driven upper roller bearing against said bearing surfaces of said plurality of segments, said segments having an overhanging rail, and an oppositely driven lower roller mounted coaxially with said upper roller and bearing against said curved inner portion of said auxiliary segment.

4. An adjustable template according to claim 1,

wherein said supporting plate consists of two essentially symmetric halves being displaceable against one another, and said segments are provided with tapped holes, further comprising a guide rail for connecting said segments located on one of said two halves with said segments located on the other half of said supporting plate, said guide rail being provided with an oblong hole and fastening means for attaching said guide rail to said tapped holes of said segments.

5. An adjustable template according to claim. 1, wherein said template is formed by a plurality of segments and two of said segments forming an internal corner of said template, are provided with means for moving said template follower means out of said internal corner into a new path after entering said comer.

6. An adjustable template according to claim 5,

wherein said two segments forming an internal corner of said template are symmetrical parts, said template follower means including a driven roller bearing against said segments, and a gear pinion mounted coaxially with said roller, said means for moving said template follower means out of said internal comer, comprising a toothed segment eccentrically pivoted on each of two said segments for acting like a lever when said gear pinion meshes with said toothed segment after entering said internal corner in order to push said roller and said gear pinion out of said internal corner into a path determined by the curve of said template, and torsion spring means for holding and removing said toothed segment into the normal positon after disengaging of said gear pinion from said toothed segment.

7. An adjustable template according to claim 6, wherein said template is formed by a plurality of segments and said two segments forming an internal corner of said template, are symmetrical parts and provided with an overhanging rail forming a bearing surface for said gear pinion, an oblong hole and fastening means for attaching said overhanging rail to one of said segments having one of said means for moving said template follower means out of said internal corner.

8. In a sewing device with guided control of a sewing cycle for sewing workpieces of different shape and size, comprising, in combination, a support means, a swingable jib pivoted to said support means, a link arm carried by said jib, a supporting arm hinged to said linked arm, a sewing machine carried by said supporting arm and having a vertically reciprocating needle, a workpiece clamp holder arranged on said support means, a driven upper magnetic roller, a gear pinion below and coaxially secured to said upper magnetic roller, an oppositely driven lower magnetic roller mounted coaxially with said upper magnetic roller and said gear pinion, said magnetic rollers and said gear pinion being coaxially disposed with said needle, drive means provided with means for reversing the direction of rotation, and a reversing gear for driving said lower magnetic roller and said upper magnetic roller connected with said gear pinion, in contrary direction, an adjustable template consisting of two essentially symmetric halves I guide rail to said tapped holes of said segments, setscrew means within said oblong holes of said segments and said slotted holes arranged in longitudinal and angular directions within said template halves, for fastening said segments to said supporting plate halves, and means for moving said magnetic rollers out of an internal corner formed by a segment fastened to said longitudinally directed slotted hole, and an adjacent symmetrical segment fastened to said angularly directed slotted hole, said moving means comprising a toothed segment eccentrically pivoted on each of said two segments for acting like a lever when said gear pinion meshes with said toothed segment after entering said internal comer, in order to push said roller and said gear pinion into a direction of course determined by the curve of said template, and torsion spring means for holding and removing said toothed segment into the normal position after disengaging of said gear pinion from said toothed segment. 

1. An adjustable template for use in a sewing device for sewing workpieces of different shape and size, comprising a supporting plate provided with a plurality of slotted holes arranged in longitudinal and angular direction with respect to said supporting plate, a plurality of segments having wedge-shaped lateral edges, a bearing surface for a template follower means and an oblong hole in the longitudinal direction of each of said segments, and set screw means in said oblong holes and said slotted holes for fastening said segments to said supporting plate after alignment of said bearing surfaces of said segments according to the required course of a seam.
 2. An adjustable template according to claim 1, wherein said segments fastened in said slotted holes running in an angular direction with respect to said longitudinal slotted holes, are provided with an overhanging rail for forming a lateral bearing surface for said template follower means.
 3. An adjustable template according to claim 2, wherein said template comprises a plurality of said segments having a bearing surface for said template follower means, said segments having an overhanging rail for forming a lateral bearing surface for said template follower means, and an auxiliary segment having a curved inner portion and disposed below the plane of and oppositely to said segment having an overhanging rail, said template follower means including a driven upper roller bearing against said bearing surfaces of said plurality of segments, said segments having an overhanging rail, and an oppositely driven lower roller mounted coaxially with said upper roller and bearing against said curved inner portion of said auxiliary segment.
 4. An adjustable template according to claim 1, wherein said supporting plate consists of two essentially symmetric halves being displaceable against one another, and said segments are provided with tapped holes, further comprising a guide rail for connecting said segments located on one of said two halves with said segments located on the other half of said supporting plate, said guide rail being provided with an oblong hole and fastening means for attaching said guide rail to said tapped holes of said segments.
 5. An adjustable template according to claim 1, wherein said template is formed by a plurality of segments and two of said segments forming an internal corner of said template, are provided with means for moving said template follower means out of said internal corner into a new path after entering said corner.
 6. An adjustable template according to claim 5, wherein said two segments forming an internal corner of said template are symmetrical parts, said template follower means including a driven roller bearing against said segments, and a gear pinion mounted coaxially with said roller, said means for moving said template follower means out of said internal corner comprising a toothed segment eccentrically pivoted on each of two said segments for acting like a lever when said gear pinion meshes with said toothed segment after entering said internal corner in order to push said roller and said gear pinion out of said internal corner into a path determined by the curve of said template, and torsion spring means for holding and removing said toothed segment into the normal positon after disengaging of said gear pinion from said toothed segment.
 7. An adjustable template according to claim 6, wherein said template is formed by a plurality of segments and said two segments forming an internal corner of said template, are symmetrical parts and provided with an overhanging rail forming a bearing surface for said gear pinion, an oblong hole and fastening means for attaching said overhanging rail to one of said segments having one of said means for moving said template follower means out of said internal corner.
 8. In a sewing device with guided control of a sewing cycle for sewing workpieces of different shape and size, comprising, in combination, a support means, a swingable jib pivoted to said support means, a link arm carried by said jib, a supporting arm hinged to said linked arm, a sewing machine carried by said supporting arm and having a vertically reciprocating needle, a workpiece clamp holder arranged on said support means, a driven upper magnetic roller, a gear pinion below and coaxially secured to said upper magnetic roller, an oppositely driven lower magnetic roller mounted coaxially with said upper magnetic roller and said gear pinion, said magnetic rollers and said gear pinion being coaxially disposed with said needle, drive means provided with means for reversing the direction of rotation, and a reversing gear for driving said lower magnetic roller and said upper magnetic roller connected with said gear pinion, in contrary direction, an adjustable template consisting of two essentially symmetric halves being displaceable against one another and provided with a plurality of slotted holes arranged in longitudinal and angular directions with respect to said supporting plate halves, a plurality of segments having a wedge-shaped lateral edge, a bearing surface for said upper magnetic roller, an oblong hole in the longitudinal direction and a tapped hole, a guide rail for connecting said segments located on one half of said two halves, with said segments located on the other half of said supporting plate, said guide rail being provided with an oblong hole and fastening means for attaching said guide rail to said tapped holes of said segments, setscrew means within said oblong holes of said segments and said slotted holes arranged in longitudinal and angular directions within said template halves, for fastening said segments to said supporting plate halves, and means for moving said magnetic rollers out of an internal corner formed by a segment fastened to said longitudinally directed slotted hole, and an adjacent symmetrical segment fastened to said angularly directed slotted hole, said moving means comprising a toothed segment eccentrically pivoted on each of said two segments for acting like a lever when said gear pinion meshes with said toothed segment after entering said internal corner, in order to push said roller and said gear pinion into a direction of course determined by the curve of said template, and torsion spring means for holding and removing said toothed segment into the normal position after disengaging of said gear pinion from said toothed segment. 